Answer on Mechanics | Relativity Question for ken

2011-03-08T13:17:51-0500

Question #1845

A proton is moving at 425 m/s. (a) How much work must be done on it to stop it?(answer in joules) (A proton has a mass of 1.67&times;10&minus;27 kg.) (b) Assume the net braking force acting on it has magnitude 8.01&times;10&minus;16 N and is directed opposite to its initial velocity. Over what distance must the force be applied?(in meters) Watch your negative signs in this problem.

Expert's answer

2011-03-09T06:52:28-0500

(a) While moving with a speed of 425 m/s proton has the following kinetic energy:K = mv2/2 = 1.67&times;10&minus;27* 4252/2 = 1.51&times;10&minus;22 JRequired work is equal to this energy.

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